olsc: Add service olsc:u and stub some calls (#1734)

Ryujinx.HLE/HOS/Services/Olsc/ResultCode.cs

@@ -0,0 +1,13 @@
+namespace Ryujinx.HLE.HOS.Services.Olsc
+{
+    enum ResultCode
+    {
+        ModuleId       = 179,
+        ErrorCodeShift = 9,
+
+        Success = 0,
+
+        NullArgument   = (100 << ErrorCodeShift) | ModuleId,
+        NotInitialized = (101 << ErrorCodeShift) | ModuleId
+    }
+}